fix: expect moduleIdentifier in assemble step

Author: znck

index.d.ts

@@ -160,7 +160,7 @@ declare module VueComponentCompiler {
       normalizeComponent?: string // vue-component-compiler/src/normalize-component.js
     }
     scopeId: string // same as scopeId of style compiler.
-    moduleIdentifier?: string // autogenerated
+    moduleIdentifier?: string // ~ used in SSR
     isHot?: boolean // false
     isServer?: boolean // false
     isProduction?: boolean // true

src/assemble.js

@@ -33,7 +33,7 @@ module.exports = function assemble (source, filename, config) {
       normalizeComponent: 'vue-component-compiler/src/runtime/normalize-component'
     },
     scopeId: null,
-    moduleIdentifier: config.moduleIdentifier || hash(_s({ filename, config })), // require for server. TODO: verify this is correct.
+    moduleIdentifier: null,
     isHot: false,
     isServer: false,
     isProduction: true,